Question 295958
one liter =1000 mL
420*260=109200 mL=109.2 liters
109.2*.60= 65.52
420*.25=$105.00
105.00-65.52=$39.48 profit. 
That makes sense because they make about $.40 on every 4 glasses or 10 cents a glass.
That does not include all the free lemonade that the sellers spilled, drank or gave away.